我正在寻找一种方法来为 ScrollViewer 的滚动设置动画,我找到了一个示例,但是当我尝试将类添加到 XAML 文件时,我收到一个错误:
错误 2
找不到类型“AniScrollViewer”。确认您没有丢失程序集引用并且所有引用的程序集都已构建。
这是我在论坛中找到的代码,我将类添加到我的 cs 文件中:
public class AniScrollViewer:ScrollViewer
{
public static DependencyProperty CurrentVerticalOffsetProperty = DependencyProperty.Register("CurrentVerticalOffset", typeof(double), typeof(AniScrollViewer), new PropertyMetadata(new PropertyChangedCallback(OnVerticalChanged)));
public static DependencyProperty CurrentHorizontalOffsetProperty = DependencyProperty.Register("CurrentHorizontalOffsetOffset", typeof(double), typeof(AniScrollViewer), new PropertyMetadata(new PropertyChangedCallback(OnHorizontalChanged)));
private static void OnVerticalChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
AniScrollViewer viewer = d as AniScrollViewer;
viewer.ScrollToVerticalOffset((double)e.NewValue);
}
private static void OnHorizontalChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
AniScrollViewer viewer = d as AniScrollViewer;
viewer.ScrollToHorizontalOffset((double)e.NewValue);
}
public double CurrentHorizontalOffset
{
get { return (double)this.GetValue(CurrentHorizontalOffsetProperty); }
set { this.SetValue(CurrentHorizontalOffsetProperty, value); }
}
public double CurrentVerticalOffset
{
get { return (double)this.GetValue(CurrentVerticalOffsetProperty); }
set { this.SetValue(CurrentVerticalOffsetProperty, value); }
}
}
这是动画代码的示例:
private void ScrollToPosition(double x, double y)
{
DoubleAnimation vertAnim = new DoubleAnimation();
vertAnim.From = MainScrollViewer.VerticalOffset;
vertAnim.To = y;
vertAnim.DecelerationRatio = .2;
vertAnim.Duration = new Duration(TimeSpan.FromMilliseconds(250));
DoubleAnimation horzAnim = new DoubleAnimation();
horzAnim.From = MainScrollViewer.HorizontalOffset;
horzAnim.To = x;
horzAnim.DecelerationRatio = .2;
horzAnim.Duration = new Duration(TimeSpan.FromMilliseconds(300));
Storyboard sb = new Storyboard();
sb.Children.Add(vertAnim);
sb.Children.Add(horzAnim);
Storyboard.SetTarget(vertAnim, MainScrollViewer);
Storyboard.SetTargetProperty(vertAnim, new PropertyPath(AniScrollViewer.CurrentVerticalOffsetProperty));
Storyboard.SetTarget(horzAnim, MainScrollViewer);
Storyboard.SetTargetProperty(horzAnim, new PropertyPath(AniScrollViewer.CurrentHorizontalOffsetProperty));
sb.Begin();
}
我错过了什么?